java实现转盘抽奖；

浏览数：24 / 时间：2015年06月08日

index.jsp页面：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
   String path = request.getContextPath();
   String basePath = request.getScheme() + "://"
           + request.getServerName() + ":" + request.getServerPort()
           + path + "/";
%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta name="viewport"
   content="width=device-width,height=device-height,inital-scale=1.0,maximum-scale=1.0,user-scalable=no;">
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="apple-mobile-web-app-status-bar-style" content="black">
<meta name="format-detection" content="telephone=no">

<title>幸运大转盘抽奖</title>
<link href="files/activity-style.css" rel="stylesheet" type="text/css">
<script type="text/javascript" src="files/jquery.min.js"></script>
<script type="text/javascript" src="files/jQueryRotate.2.2.js"></script>
<script type="text/javascript" src="files/jquery.easing.min.js"></script>
<script type="text/javascript">
   $(function() {
       $("#inner").click(function() {
           lottery();
       });
   });
   function lottery() {
       $.ajax({
           type : ‘POST‘,
           url : ‘AwardServlet‘,
           dataType : ‘json‘,
           cache : false,
           error : function() {
               alert(‘出错了！‘);
               return false;
           },

           success : function(json) {
               $("#inner").unbind(‘click‘).css("cursor", "default");
               var angle = parseInt(json.angle); //角度
               var msg = json.msg; //提示信息
               $("#outer").rotate({ //inner内部指针转动，outer外部转盘转动
                   duration : 5000, //转动时间
                   angle : 0, //开始角度
                   animateTo : 3600 + angle, //转动角度
                   easing : $.easing.easeOutSine, //动画扩展
                   callback : function() {
                       var con = confirm(msg + ‘\n还要再来一次吗？‘);
                       if (con) {
                           lottery();
                       } else {
                           return false;
                       }
                   }
               });
           }
       });
   }
</script>
</head>

<body class="activity-lottery-winning">

   <div class="main">
       <script type="text/javascript">
           var loadingObj = new loading(document.getElementById(‘loading‘), {
               radius : 20,
               circleLineWidth : 8
           });
           loadingObj.show();
       </script>

       <div id="outercont">
           <div id="outer-cont" style="overflow:hidden;">
               <div id="outer">
                   <img src="files/activity-lottery-1.png" width="310px">
               </div>
           </div>
           <div id="inner-cont">
               <div id="inner">
                   <img src="files/activity-lottery-2.png">
               </div>
           </div>
       </div>
   </div>

</body>
</html>

AwardServlet.java

package com.ostarsier.servlet;

import java.io.IOException;
import java.util.Random;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* 抽奖概率算法来自：http://www.helloweba.com/view-blog-216.html
*/
public class AwardServlet extends HttpServlet {

   public void doGet(HttpServletRequest request, HttpServletResponse response)
           throws ServletException, IOException {
       Object[][] prizeArr = new Object[][]{
               //id,min,max，prize【奖项】,v【中奖率】
               //外面的转盘转动
//               {1,1,14,"一等奖",1},
//               {2,346,364,"一等奖",1},
//               {3,16,44,"不要灰心",10},
//               {4,46,74,"神马也没有",10},
//               {5,76,104,"祝您好运",10},
//               {6,106,134,"二等奖",2},
//               {7,136,164,"再接再厉",10},
//               {8,166,194,"神马也没有",10},
//               {9,196,224,"运气先攒着",10},
//               {10,226,254,"三等奖",5},
//               {11,256,284,"要加油哦",10},
//               {12,286,314,"神马也没有",10},
//               {13,316,344,"谢谢参与",10}

               //里面的指针转动
               {1,1,14,"一等奖",1},
               {2,346,364,"一等奖",1},
               {3,16,44,"不要灰心",10},
               {4,46,74,"神马也没有",10},
               {5,76,104,"祝您好运",10},
               {6,106,134,"二等奖",2},
               {7,136,164,"再接再厉",10},
               {8,166,194,"神马也没有",10},
               {9,196,224,"运气先攒着",10},
               {10,226,254,"三等奖",5},
               {11,256,284,"要加油哦",10},
               {12,286,314,"神马也没有",10},
               {13,316,344,"谢谢参与",10}
       };
       Object result[] = award(prizeArr);//抽奖后返回角度和奖品等级
       response.setContentType("text/html;charset=UTF-8");
       response.getWriter().write("{\"angle\":\""+result[0]+"\",\"msg\":\""+result[2]+"\"}");
       System.out.println("转动角度:"+result[0]+"\t奖项ID:"+result[1]+"\t提示信息:"+result[2]);
   }

   //抽奖并返回角度和奖项
   public Object[] award(Object[][] prizeArr){
       //概率数组
       Integer obj[] = new Integer[prizeArr.length];
       for(int i=0;i<prizeArr.length;i++){
           obj[i] = (Integer) prizeArr[i][4];
       }
       Integer prizeId = getRand(obj); //根据概率获取奖项id
       //旋转角度
       int angle = new Random().nextInt((Integer)prizeArr[prizeId][2]-(Integer)prizeArr[prizeId][1])+(Integer)prizeArr[prizeId][1];
       String msg = (String) prizeArr[prizeId][3];//提示信息
       return new Object[]{angle,prizeId,msg};
   }
   //根据概率获取奖项
   public Integer getRand(Integer obj[]){
       Integer result = null;
       try {
           int sum = 0;//概率数组的总概率精度
           for(int i=0;i<obj.length;i++){
               sum+=obj[i];
           }
           for(int i=0;i<obj.length;i++){//概率数组循环
               int randomNum = new Random().nextInt(sum);//随机生成1到sum的整数
               if(randomNum<obj[i]){//中奖
                   result = i;
                   break;
               }else{
                   sum -=obj[i];
               }

           }
       } catch (Exception e) {
           e.printStackTrace();
       }
       return result;
   }

   public void doPost(HttpServletRequest request, HttpServletResponse response)
           throws ServletException, IOException {
       doGet(request, response);
   }

}
具体代码：http://download.csdn.net/detail/mll999888/8578381